Improvement in let-off mechanisms



A. J, WOODMAN.'

Improvement in Let-Offv Mechanisms. N0, 129,915. l Patented July 30,1872,

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UNITED fS'rA'rEs TENT OEEro IMPROVEMENT IN LET-OFF MECHANISMS.

Specification formingpart of Letters Patent No. 129,915, dated July 30, 1872.

To allperons to whom these presents may come:

` ing, of which- Figure 1 is an end elevation, and Fig. 2 a front view of a loom-frame with my invention applied thereto, andthe let-off or delivery mechanism of the yarn-beam. Fig. 3 is a horizontal section taken through the ratchetwheel of the said delivery mechanism.

On November 14:, 1871, Letters Patent No. 120,843, for an improvement in the let -oft' mechanism for looms, were granted to me.

In carrying out my present invention I have combined an arm or lifter and a gravitating cammed lever with the lling stop-motion7 or mechanism,.or its long shaft and the drawpawl ofthe Warpdelivery mechanism, the latter being such as shown inthe said patent 5 the object of my present invention being to estop the delivery ofthe warp during the period when the lay, through momentum generated in it, may be in movement, after the lilling stopmotion may have been put in operation, in consequence of such'breakage of the fillingthread or exhaustion of it. By thus estopping the delivery of warp such warp does not become slackened during the false beats of the lay, Vbut maintains its proper tension, and what weavers term loose cloth77 is prevented from being woven.

The drawing represents the warp let-oif77 or t l delivery mechanism, of which A is the wormy shaft; B, the ratchet-wheel thereof; C, the

worm; D, the draw-pawl; and E its operativelever; I being the stud or actuator of the said lever, it being extended from the sword a of the lay L. The said draw-pawl is provided with a hook, a, is disposed between the ratchet-wheel and the loom-frame M, and furnished with a bend or cam, as shown atb. The drawpawl extends through a staple or slotted plate,

F, projected from the loom-frame,the pawl being to slide through or in the slot c of such staple or plate. On the top of the shaftA there is fixed a hand-wheel, d. By taking hold of such wheel and revolving it in one direction the draw-pawl will be moved so as to carry its 'cam b against the front end of the slot c, whereby, by continuance of the motion of the hand-wheel, the draw-pawlwill be caused by the cam to be thrown out of engagement with the ratchet-wheel. This 'enables a personat any time to revolve the yarnbeam in either direction by manual power applied to the hand-wheel, it' being frequently desirable to do so for reasons well understood by Weavers.

The mechanism thus described is analogous to what is set forth and claimed in my said patent. I have applied to it or the draw-pawl D thereof, and the lling stop-motion or the long shaft Nthereof, a lifter-arm, O, and a gravitating cammed lever P, formed and arrangedl as shown.

Fig. 4 is a top view, Fig. 5 a side elevation, and Fig. 6 a front-end view of the gravitating-lever, the latter ligure exhibiting the arrangement of the cam of the lever with the shank of the draw-pawl D.

The `gravitating-lever on the end of the loom-frame and pivoted thereto, as shown at O, has at the end of its lower arm an inclined cam, P, the other or upper arm being hooked upon the end of the lifter arm, and made heavier than the lower arm so as to overbalance and raise it whenever the lifter-arm drops downward. Instead of so constructing the upper arm I sometimes employ a spring to effeet the raising of the lower arm.

Should the Ashuttle-threador filling break, or become run out, or be exhausted in the shuttle, what is termed by weavers the filling stop-motion77 will be put in action to effect stoppage of the loom or the casting of the driving-belt7 from the fast to the loose pulley. The long shaft N and the upright arm R constitute well-known parts of such filling stop-motion, the fork, slide, or carrier of which is usually disposed in front of the said arm It, which is movedI back during a rearward movement of the slide. Such a motion of the arm R causes the long shaft N to turn in its bearings and raise the arm or lifter O, whereby the gravitating cammed lever P- will be moved on its fulcrum so as to force the cam p down against the draw-pawl in a manner to crowd it away from and retain it out of action upon the ratchet-wheel B, thereby preventing any deliyery of warp during the false play of the lay or that which, after the shipper has been actuated so as to throw the driving-belt upon the loose pulley, is due ltothe momentum previously generated in the l herein make no claim to the mechanism for effecting delivery of the Warp, nor to the filling stop-motion, or any part thereof.

What I claim is- The arm or lifter O and the gravitating' eammed lever P, as arranged and combined together, and with the draW-pawl D of the Warp let-off or delivery mechanism, and with the long shaft N of the filling stop-motion, all being substantially as described.

ANDREW J. WOODMAN.

Witnesses:

R. H. EDDY, S.,N. PIPER. 

